linux-kernel - [PATCH 6.0 528/862] phy: qcom-qmp-usb: fix memleak on probe deferral

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Date:   Wed, 19 Oct 2022 10:30:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 528/862] phy: qcom-qmp-usb: fix memleak on probe deferral

From: Johan Hovold <johan+linaro@...nel.org>

[ Upstream commit a5d6b1ac56cbd6b5850a3a54e35f1cb71e8e8cdd ]

Switch to using the device-managed of_iomap helper to avoid leaking
memory on probe deferral and driver unbind.

Note that this helper checks for already reserved regions and may fail
if there are multiple devices claiming the same memory.

Two bindings currently rely on overlapping mappings for the PCS region
so fallback to non-exclusive mappings for those for now.

Fixes: e78f3d15e115 ("phy: qcom-qmp: new qmp phy driver for qcom-chipsets")
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
Link: https://lore.kernel.org/r/20220916102340.11520-7-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-usb.c |   61 +++++++++++++++++++++++---------
 1 file changed, 44 insertions(+), 17 deletions(-)

--- a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
@@ -2489,6 +2489,21 @@ static const struct phy_ops qcom_qmp_phy
 	.owner		= THIS_MODULE,
 };
 
+static void __iomem *qmp_usb_iomap(struct device *dev, struct device_node *np,
+					int index, bool exclusive)
+{
+	struct resource res;
+
+	if (!exclusive) {
+		if (of_address_to_resource(np, index, &res))
+			return IOMEM_ERR_PTR(-EINVAL);
+
+		return devm_ioremap(dev, res.start, resource_size(&res));
+	}
+
+	return devm_of_iomap(dev, np, index, NULL);
+}
+
 static
 int qcom_qmp_phy_usb_create(struct device *dev, struct device_node *np, int id,
 			void __iomem *serdes, const struct qmp_phy_cfg *cfg)
@@ -2497,8 +2512,18 @@ int qcom_qmp_phy_usb_create(struct devic
 	struct phy *generic_phy;
 	struct qmp_phy *qphy;
 	char prop_name[MAX_PROP_NAME];
+	bool exclusive = true;
 	int ret;
 
+	/*
+	 * FIXME: These bindings should be fixed to not rely on overlapping
+	 *        mappings for PCS.
+	 */
+	if (of_device_is_compatible(dev->of_node, "qcom,sdx65-qmp-usb3-uni-phy"))
+		exclusive = false;
+	if (of_device_is_compatible(dev->of_node, "qcom,sm8350-qmp-usb3-uni-phy"))
+		exclusive = false;
+
 	qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
 	if (!qphy)
 		return -ENOMEM;
@@ -2511,17 +2536,17 @@ int qcom_qmp_phy_usb_create(struct devic
 	 * For dual lane PHYs: tx2 -> 3, rx2 -> 4, pcs_misc (optional) -> 5
 	 * For single lane PHYs: pcs_misc (optional) -> 3.
 	 */
-	qphy->tx = of_iomap(np, 0);
-	if (!qphy->tx)
-		return -ENOMEM;
-
-	qphy->rx = of_iomap(np, 1);
-	if (!qphy->rx)
-		return -ENOMEM;
-
-	qphy->pcs = of_iomap(np, 2);
-	if (!qphy->pcs)
-		return -ENOMEM;
+	qphy->tx = devm_of_iomap(dev, np, 0, NULL);
+	if (IS_ERR(qphy->tx))
+		return PTR_ERR(qphy->tx);
+
+	qphy->rx = devm_of_iomap(dev, np, 1, NULL);
+	if (IS_ERR(qphy->rx))
+		return PTR_ERR(qphy->rx);
+
+	qphy->pcs = qmp_usb_iomap(dev, np, 2, exclusive);
+	if (IS_ERR(qphy->pcs))
+		return PTR_ERR(qphy->pcs);
 
 	if (cfg->pcs_usb_offset)
 		qphy->pcs_usb = qphy->pcs + cfg->pcs_usb_offset;
@@ -2533,9 +2558,9 @@ int qcom_qmp_phy_usb_create(struct devic
 	 * offset from the first lane.
 	 */
 	if (cfg->is_dual_lane_phy) {
-		qphy->tx2 = of_iomap(np, 3);
-		qphy->rx2 = of_iomap(np, 4);
-		if (!qphy->tx2 || !qphy->rx2) {
+		qphy->tx2 = devm_of_iomap(dev, np, 3, NULL);
+		qphy->rx2 = devm_of_iomap(dev, np, 4, NULL);
+		if (IS_ERR(qphy->tx2) || IS_ERR(qphy->rx2)) {
 			dev_warn(dev,
 				 "Underspecified device tree, falling back to legacy register regions\n");
 
@@ -2545,15 +2570,17 @@ int qcom_qmp_phy_usb_create(struct devic
 			qphy->rx2 = qphy->rx + QMP_PHY_LEGACY_LANE_STRIDE;
 
 		} else {
-			qphy->pcs_misc = of_iomap(np, 5);
+			qphy->pcs_misc = devm_of_iomap(dev, np, 5, NULL);
 		}
 
 	} else {
-		qphy->pcs_misc = of_iomap(np, 3);
+		qphy->pcs_misc = devm_of_iomap(dev, np, 3, NULL);
 	}
 
-	if (!qphy->pcs_misc)
+	if (IS_ERR(qphy->pcs_misc)) {
 		dev_vdbg(dev, "PHY pcs_misc-reg not used\n");
+		qphy->pcs_misc = NULL;
+	}
 
 	snprintf(prop_name, sizeof(prop_name), "pipe%d", id);
 	qphy->pipe_clk = devm_get_clk_from_child(dev, np, prop_name);